/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.format.support;

import org.springframework.core.convert.support.DefaultConversionService;
import org.springframework.format.FormatterRegistry;
import org.springframework.format.datetime.DateFormatterRegistrar;
import org.springframework.format.datetime.joda.JodaTimeFormatterRegistrar;
import org.springframework.format.datetime.standard.DateTimeFormatterRegistrar;
import org.springframework.format.number.NumberFormatAnnotationFormatterFactory;
import org.springframework.format.number.money.CurrencyUnitFormatter;
import org.springframework.format.number.money.Jsr354NumberFormatAnnotationFormatterFactory;
import org.springframework.format.number.money.MonetaryAmountFormatter;
import org.springframework.lang.Nullable;
import org.springframework.util.ClassUtils;
import org.springframework.util.StringValueResolver;

/**
 * A specialization of {@link FormattingConversionService} configured by default with
 * converters and formatters appropriate for most applications.
 *
 * <p>Designed for direct instantiation but also exposes the static {@link #addDefaultFormatters}
 * utility method for ad hoc use against any {@code FormatterRegistry} instance, just
 * as {@code DefaultConversionService} exposes its own
 * {@link DefaultConversionService#addDefaultConverters addDefaultConverters} method.
 *
 * <p>Automatically registers formatters for JSR-354 Money & Currency, JSR-310 Date-Time
 * and/or Joda-Time, depending on the presence of the corresponding API on the classpath.
 *
 * @author Chris Beams
 * @author Juergen Hoeller
 * @since 3.1
 */
public class DefaultFormattingConversionService extends FormattingConversionService {

    private static final boolean jsr354Present;

    private static final boolean jodaTimePresent;

    static {
        ClassLoader classLoader = DefaultFormattingConversionService.class.getClassLoader();
        jsr354Present = ClassUtils.isPresent("javax.money.MonetaryAmount", classLoader);
        jodaTimePresent = ClassUtils.isPresent("org.joda.time.LocalDate", classLoader);
    }


    /**
     * Create a new {@code DefaultFormattingConversionService} with the set of
     * {@linkplain DefaultConversionService#addDefaultConverters default converters} and
     * {@linkplain #addDefaultFormatters default formatters}.
     */
    public DefaultFormattingConversionService() {
        this(null, true);
    }

    /**
     * Create a new {@code DefaultFormattingConversionService} with the set of
     * {@linkplain DefaultConversionService#addDefaultConverters default converters} and,
     * based on the value of {@code registerDefaultFormatters}, the set of
     * {@linkplain #addDefaultFormatters default formatters}.
     *
     * @param registerDefaultFormatters whether to register default formatters
     */
    public DefaultFormattingConversionService(boolean registerDefaultFormatters) {
        this(null, registerDefaultFormatters);
    }

    /**
     * Create a new {@code DefaultFormattingConversionService} with the set of
     * {@linkplain DefaultConversionService#addDefaultConverters default converters} and,
     * based on the value of {@code registerDefaultFormatters}, the set of
     * {@linkplain #addDefaultFormatters default formatters}.
     *
     * @param embeddedValueResolver     delegated to {@link #setEmbeddedValueResolver(StringValueResolver)}
     *                                  prior to calling {@link #addDefaultFormatters}.
     * @param registerDefaultFormatters whether to register default formatters
     */
    public DefaultFormattingConversionService(
            @Nullable StringValueResolver embeddedValueResolver, boolean registerDefaultFormatters) {

        if (embeddedValueResolver != null) {
            setEmbeddedValueResolver(embeddedValueResolver);
        }
        DefaultConversionService.addDefaultConverters(this);
        if (registerDefaultFormatters) {
            addDefaultFormatters(this);
        }
    }


    /**
     * Add formatters appropriate for most environments: including number formatters,
     * JSR-354 Money & Currency formatters, JSR-310 Date-Time and/or Joda-Time formatters,
     * depending on the presence of the corresponding API on the classpath.
     *
     * @param formatterRegistry the service to register default formatters with
     */
    public static void addDefaultFormatters(FormatterRegistry formatterRegistry) {
        // Default handling of number values
        formatterRegistry.addFormatterForFieldAnnotation(new NumberFormatAnnotationFormatterFactory());

        // Default handling of monetary values
        if (jsr354Present) {
            formatterRegistry.addFormatter(new CurrencyUnitFormatter());
            formatterRegistry.addFormatter(new MonetaryAmountFormatter());
            formatterRegistry.addFormatterForFieldAnnotation(new Jsr354NumberFormatAnnotationFormatterFactory());
        }

        // Default handling of date-time values

        // just handling JSR-310 specific date and time types
        new DateTimeFormatterRegistrar().registerFormatters(formatterRegistry);

        if (jodaTimePresent) {
            // handles Joda-specific types as well as Date, Calendar, Long
            new JodaTimeFormatterRegistrar().registerFormatters(formatterRegistry);
        } else {
            // regular DateFormat-based Date, Calendar, Long converters
            new DateFormatterRegistrar().registerFormatters(formatterRegistry);
        }
    }

}
